What is vengeance if you can’t remember who it is you’re avenging? Isn’t memory what vengeance is all about? Vengeance is always personal, and usually results in at least a few more deaths than originally intended, many of them more than a little mordantly ironic. That’s part of what makes a revenge thriller thrilling, and Johnnie To’s terrific, slow-burn triad actioner Vengeance, adds a memory glitch to those thrills. Vengeance is a rich, fragrant reduction of To’s favorite themes (male bonding and codes of loyalty, the triad underworld, vengeance) trademarks (slow-motion clouds of blood, unforgettable set-pieces, impossibly sleek cinematography, brooding men, black humor) and actors (Anthony Wong, Simon Yam, Lam Suet). One splendid difference: Vengeance stars French actor and singer Johnny Hallyday (adding a nice tip of the chapeau to the French noirs of the ’60s, when Hallyday had his rock and roll heyday). Hallyday plays François Costello, a Parisian restaurant owner who is in Macau at the request of his daughter—to avenge a savage attack on her family. Costello crosses paths with a crack team of triad hit men, whom he then hires to carry out his own revenge plan—a plan growing increasingly hazy due to his deteriorating memory. The craggy, lived-in face of Hallyday is as riveting as To’s mad scenes of mayhem, which include a fierce nighttime shootout as clouds pass over the full moon and—shootouts being To’s stock in trade—an epic battle in a junkyard that has to be seen to be believed. Vengeance, indeed, is a dish best served by Johnnie To.